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When we're outlining a sequence that ends in a call, we can save up to three instructions in the outlined function by turning the call into a tail-call. I refer to this as thunk outlining because the resulting outlined function looks like a thunk; suggestions welcome for a better name. In addition to making the outlined function shorter, thunk outlining allows outlining calls which would otherwise be illegal to outline: we don't need to save/restore LR, so we don't need to prove anything about the stack access patterns of the callee. To make this work effectively, I also added MachineOutlinerInstrType::LegalTerminator to the generic MachineOutliner code; this allows treating an arbitrary instruction as a terminator in the suffix tree. Differential Revision: https://reviews.llvm.org/D47173 llvm-svn: 333015
170 lines
4.6 KiB
YAML
170 lines
4.6 KiB
YAML
# RUN: llc -mtriple=aarch64--- -run-pass=prologepilog -run-pass=machine-outliner -verify-machineinstrs %s -o - | FileCheck %s
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--- |
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@x = common global i32 0, align 4
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define void @baz() #0 {
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ret void
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}
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define i32 @main() #0 {
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ret i32 0
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}
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define void @bar(i32 %a) #0 {
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ret void
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}
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attributes #0 = { noinline noredzone "no-frame-pointer-elim"="true" }
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...
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---
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# This test ensures that we
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# - Create outlined functions
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# - Don't outline anything to do with LR or W30
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# - Save LR when it's not available
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# - Don't outline stack instructions when we might need to save + restore
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# - Functions whose addresses are taken can still be outlined
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#
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# CHECK-LABEL: name: main
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# CHECK: BL @OUTLINED_FUNCTION_[[F0:[0-9]+]]
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# CHECK-NEXT: early-clobber $sp, $lr = LDRXpost $sp, 16
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# CHECK-NEXT: $x16 = ADDXri $sp, 48, 0
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# CHECK-NEXT: STRHHroW $w16, $x9, $w30, 1, 1
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# CHECK-NEXT: $lr = ORRXri $xzr, 1
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# CHECK: BL @OUTLINED_FUNCTION_[[F0]]
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# CHECK-NEXT: early-clobber $sp, $lr = LDRXpost $sp, 16
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# CHECK-NEXT: $x16 = ADDXri $sp, 48, 0
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# CHECK-NEXT: STRHHroW $w16, $x9, $w30, 1, 1
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# CHECK-NEXT: $lr = ORRXri $xzr, 1
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# CHECK: BL @OUTLINED_FUNCTION_[[F0]]
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# CHECK-NEXT: early-clobber $sp, $lr = LDRXpost $sp, 16
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# CHECK-NEXT: $x16 = ADDXri $sp, 48, 0
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# CHECK-NEXT: STRHHroW $w16, $x9, $w30, 1, 1
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# CHECK-NEXT: $lr = ORRXri $xzr, 1
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name: main
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tracksRegLiveness: true
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body: |
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bb.0:
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$sp = frame-setup SUBXri $sp, 16, 0
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renamable $x9 = ADRP target-flags(aarch64-page) @bar
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$x9 = ORRXri $xzr, 1
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$w16 = ORRWri $wzr, 1
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$w30 = ORRWri $wzr, 1
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$lr = ORRXri $xzr, 1
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$x20, $x19 = LDPXi $sp, 10
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$w16 = ORRWri $wzr, 1
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$w16 = ORRWri $wzr, 1
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$w16 = ORRWri $wzr, 1
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$w16 = ORRWri $wzr, 1
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$w16 = ORRWri $wzr, 1
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$w16 = ORRWri $wzr, 1
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renamable $x9 = ADRP target-flags(aarch64-page) @x
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$x16 = ADDXri $sp, 48, 0;
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STRHHroW $w16, $x9, $w30, 1, 1
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$lr = ORRXri $xzr, 1
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$w3 = ORRWri $wzr, 1993
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$x20, $x19 = LDPXi $sp, 10
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$w16 = ORRWri $wzr, 1
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$w16 = ORRWri $wzr, 1
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$w16 = ORRWri $wzr, 1
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$w16 = ORRWri $wzr, 1
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$w16 = ORRWri $wzr, 1
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$w16 = ORRWri $wzr, 1
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renamable $x9 = ADRP target-flags(aarch64-page) @x
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$x16 = ADDXri $sp, 48, 0;
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STRHHroW $w16, $x9, $w30, 1, 1
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$lr = ORRXri $xzr, 1
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$w4 = ORRWri $wzr, 1994
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$x20, $x19 = LDPXi $sp, 10
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$w16 = ORRWri $wzr, 1
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$w16 = ORRWri $wzr, 1
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$w16 = ORRWri $wzr, 1
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$w16 = ORRWri $wzr, 1
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$w16 = ORRWri $wzr, 1
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$w16 = ORRWri $wzr, 1
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renamable $x9 = ADRP target-flags(aarch64-page) @x
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$x16 = ADDXri $sp, 48, 0;
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STRHHroW $w16, $x9, $w30, 1, 1
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$lr = ORRXri $xzr, 1
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$sp = ADDXri $sp, 16, 0
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RET undef $lr
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...
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---
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# This test ensures that we can avoid saving LR when it's available.
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# It also makes sure that KILL instructions don't impact outlining.
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# CHECK-LABEL: bb.1:
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# CHECK-NOT: BL @baz, implicit-def dead $lr, implicit $sp
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# CHECK: BL @OUTLINED_FUNCTION_[[F1:[0-9]+]], implicit-def $lr, implicit $sp
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# CHECK-NEXT: $w17 = ORRWri $wzr, 2
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# CHECK-NEXT: BL @OUTLINED_FUNCTION_[[F1]], implicit-def $lr, implicit $sp
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# CHECK-NEXT: $w8 = ORRWri $wzr, 0
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# CHECK-NOT: $w17 = KILL renamable $w17, implicit killed $w17
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name: bar
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $w0, $lr, $w8
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$sp = frame-setup SUBXri $sp, 32, 0
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$fp = frame-setup ADDXri $sp, 16, 0
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bb.1:
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BL @baz, implicit-def dead $lr, implicit $sp
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$w17 = ORRWri $wzr, 1
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$w17 = ORRWri $wzr, 1
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$w17 = KILL renamable $w17, implicit killed $w17
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$w17 = ORRWri $wzr, 1
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$w17 = ORRWri $wzr, 1
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BL @baz, implicit-def dead $lr, implicit $sp
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$w17 = ORRWri $wzr, 1
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$w17 = ORRWri $wzr, 1
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$w17 = ORRWri $wzr, 2
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BL @baz, implicit-def dead $lr, implicit $sp
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$w17 = ORRWri $wzr, 1
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$w17 = ORRWri $wzr, 1
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$w17 = ORRWri $wzr, 1
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$w17 = ORRWri $wzr, 1
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BL @baz, implicit-def dead $lr, implicit $sp
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$w17 = ORRWri $wzr, 1
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$w17 = ORRWri $wzr, 1
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$w8 = ORRWri $wzr, 0
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bb.2:
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$w15 = ORRWri $wzr, 1
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$w15 = ORRWri $wzr, 1
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$w15 = ORRWri $wzr, 1
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$w15 = ORRWri $wzr, 1
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$x15 = ADDXri $sp, 48, 0;
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$w9 = ORRWri $wzr, 0
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$w15 = ORRWri $wzr, 1
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$w15 = ORRWri $wzr, 1
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$w15 = ORRWri $wzr, 1
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$w15 = ORRWri $wzr, 1
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$x15 = ADDXri $sp, 48, 0;
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$w8 = ORRWri $wzr, 0
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bb.3:
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$fp, $lr = LDPXi $sp, 2
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$sp = ADDXri $sp, 32, 0
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RET undef $lr
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...
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---
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name: baz
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $w0, $lr, $w8
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RET undef $lr
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# CHECK-LABEL: name: OUTLINED_FUNCTION_{{[0-9]}}
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# CHECK=LABEL: name: OUTLINED_FUNCTION_{{[1-9]}}
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